Post-market data and literature review were used to evaluate the performance and safety of the predicate device engine (picoSat IP45) to support the substantial equivalence of the subject device.
Post-market surveillance; MAUDE database; Literature review
Clinical Evidence
Study Design
Population
Comparator
Key Endpoints
Post-market data review; Retrospective analysis of post-market surveillance data; Follow-up/Duration: April 2009 through June 2010; Study Period: April 2009 - June 2010
Users of Philips SureSigns VM and VS products containing the picoSat IP45 engine; Sample Size: >380 units distributed domestically
Not applicable for this study
Failure rate and reportable events
Indications for Use
The Dixtal DX-4100 Series Pulse Oximeter monitors are intended to provide continuous, non-invasive monitoring of functional arterial oxygen saturation (SpO2) and pulse rate in neonatal, infant, pediatric and adult patients, in environments where pulse oximetry is indicated for use, when in the judgment of a licensed medical practitioner/physician pulse oximetry is required.
Device Story
Bedside pulse oximeter monitor; provides continuous, non-invasive measurement of functional arterial oxygen saturation (SpO2) and pulse rate. Inputs: red and infrared light signals from patient-attached sensors (finger or toe) passing through pulsating vascular bed. Operation: light absorption differences between oxygenated and deoxygenated hemoglobin measured via photodiode; signal split, filtered, and processed to calculate SpO2 and pulse rate (via time interval between infrared waveform peaks). Output: numerical SpO2/pulse rate values and plethysmogram waveform on display. Used in clinical settings (ICU, NICU, PICU, respiratory therapy, anesthesia, hospital transport) by healthcare professionals. Assists clinicians in patient oxygenation assessment and clinical decision-making. Benefits: non-invasive, real-time monitoring of patient respiratory status.
Clinical Evidence
Controlled de-saturation accuracy testing performed using Dixtal DX Series sensors and the VM-1 monitor. Post-market data from the FDA MAUDE database and scientific literature for the VM-1 (picoSat IP45 engine) showed a <0.5% failure rate over 15 months with no reportable events. No new clinical trials were required; evidence relies on previously cleared sensor data (K100020) and predicate performance history.
Technological Characteristics
Stand-alone bedside pulse oximeter. Uses picoSAT IP44 SpO2 engine. Materials: Silicone (sensor heads, spring), Polycarbonate (shell), PVC (bladder), PBT (connectors), Polyurethane (cable). No latex, DEHP, or phthalates. Sensing: Red (660nm) and Infrared (940nm) light sources. Connectivity: Direct sensor connection (Dixtal or Philips receptacles). Power: Internal battery/power supply. Software: Embedded signal processing for SpO2 and pulse rate calculation.
Indications for Use
Indicated for continuous, non-invasive monitoring of functional arterial oxygen saturation (SpO2) and pulse rate in neonatal, infant, pediatric, and adult patients in clinical environments where pulse oximetry is required by a physician.
Regulatory Classification
Identification
An oximeter is a device used to transmit radiation at a known wavelength(s) through blood and to measure the blood oxygen saturation based on the amount of reflected or scattered radiation. It may be used alone or in conjunction with a fiberoptic oximeter catheter.
Philips picoSat II Pulse Oximeter engine (K081937)
Reference Devices
Dixtal Pulse Oximetry DX Series SpO2 Sensors (K100020)
Submission Summary (Full Text)
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## (SPECIAL) 510(k) SUMMARY
JUL 2 5 2011
K103285.
## Submitter's Name and Address
(Device Sponsor and Manufacturer) Dixtal Medical, Inc. 101 N. Plains Industrial Road Bldg 2 Wallingford, CT 06492
## Contact Person
Robert H. Schiffman, R.A.C. (EU) Quality Assurance Manager (203) 269-1112, Ext. 240 (203) 269-1760 (facsimile) robert.schiffman@philips.com
3006891479 Establishment Registration Number:
September 24, 2010 Date the Summary was Prepared:
## Device/Trade Name/Common Name/Classification
| Device Names (Proprietary/Trade Names): | Dixtal DX-4100 Series Pulse Oximeter |
|-----------------------------------------|--------------------------------------|
| Device Name (Common Name): | Pulse Oximeter Monitor |
| Classification: | Class II, 21CFR 870.2700/74DQA |
## Legally Marketed Predicate Devices
Legally marketed predicate devices to the Dixtal DX-4100 Series Pulse Oximeter:
- Philips Sure Signs Monitor, Model VM-1 (K082280) .
- Philips picoSat II Pulse Oximeter engine (K081937) .
## Description of the Subject Device
The DX-4100 Series Pulse Oximeter Monitors is a modification to the Philips VM-1 (K081937) SpQz/CO₂ Monitor. The Monitor uses the same picoSAT IP44 SpO₂ engine as the VM-1, the same power supply, battery and technically the same display (same resolution as used in the VM-1) and has the same intended use as the VM-1 (Pulse Oximetry only). The Monitors will use the Dixtal (FDA cleared: K100020) Pulse Oximetry DX Series SpO2 Sensors. A second version of the DX-4100 Series Pulse Oximeter is equipped with the Philips receptacle thereby providing direct connection to the full line of sensors as indicated for the VM-1. Accuracy testing included with the sensor submission was performed with the Philips VM-1 monitor.
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### Statement of Intended Use
The Dixtal DX-4100 Series Pulse Oximeter monitors are intended to provide continuous, non-invasive monitoring of functional arterial oxygen saturation (SpQ₂) and pulse rate in neonatal, infant, pediatric and adult patients, in environments where pulse oximetry is indicated for use, when in the judgment of a licensed medical practitioner/physician pulse oximetry is required.
### Environments of Use
The Dixtal DX-4100 Series Pulse Oximeter monitors is intended for use in healthcare environments including but not limited to, respiratory therapy, anesthesia, the intensive care unit (ICU), neonatal (NICU) and pediatric (PICU) intensive care units, hospital transport, and other environments where pulse oximetry is required.
#### Technological Characteristics
The Dixtal DX-4100 Series is a stand-alone Pulse Oximeter monitor. The device uses the same Pulse Oximetry engine as the predicate device (Philips Sure Signs Monitor, Model VM-1: K082280) as well as the same power supply and battery. The display is similar to the predicate device providing the same resolution as available with the VM-1. The Monitor has been designed to use the Dixtal (FDA cleared: K100020) Pulse Oximetry DX Series SpQ Sensors. A second version of the monitor will be equipped with the Philips receptacle and for use the Philips SpQ2 sensors.
#### Performance Data
#### Non-Clinical data
### Biocompatibility, Cleaning and Disinfection
The DX-4100 Series Pulse Oximeter Monitors is a bedside monitor that is not intended for contact with patients and is only momentarily in contact with the clinical personnel. Therefore the monitor does not meet the criteria for Biocompatibility testing. The sensors intended for use with the monitor have been previously tested to assure biocompatibility for skin contact devices. SpO2 sensors are labeled for reuse and can be cleaned to achieve a low level disinfection. The monitor can be wiped down for low level disinfection and cleaning.
#### Risks to Health
The Risk Assessment associated with the use of Pulse Oximeters and their sensors has been conducted and is documented and included in the Design Control Activities section of this submission. The Risk Assessment concluded the device is safe and effective for its intended use.
F
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## (SPECIAL) 510(k) SUMMARY
Oxygen Saturation Sensors-Materials
## Y-Sensor:
Sensor heads: silicone Cable: silicone Connector: PBT (thermoplastic polyester)
· ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
## Finger Sensor:
Shell: Polycarbonate Bladder: PVC Foam spring: Silicone Cable: Polyurethane Connector: PBT (thermoplastic polyester)
Note - There is not any latex or natural rubber (which contains trace levels of latex), DEHP or Phthalates in these devices.
## Performance Data
## Clinical data
Controlled de-Sat (Accuracy) Testing was performed with the Dixtal DX Series sensors and the VM-1. This data was initially submitted in support of the recently cleared Premarket Submission for the Dixtal DX Series Sensors (K100020).
Literature review has been conducted, summarized and is presented in the design control section of this submission. The report includes Post Market data obtained from review of the FDA Maude database as well as from the scientific literature available from various publication sources.
Post Market Data specific (only) to the VM-1 (the picoSat IP45 engine is included in many of the Philips SureSigns VM and VS products) from April 2009 through June 2010 (>380 units distributed domestically) indicates less than 0.5% failure rate with no reportable events.
Conclusion: Jn compliance with Guidance documents, accepted Industry Standards and Design Control requirements, the documented results of verification and validation testing and hypoxia studies; establish the Dixtal DX Series 4100 Pulse Oximeter is substantially equivalent to the predicate devices.
F
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## (SPECIAL) 510(k) SUMMARY
### Pulse Oximetry-Background
Pulse Oximeters to which these sensors are connected measures oxygen saturation and pulse rate with sensors that contain red and infrared light sources. Since oxygen saturated blood absorbs different amounts of light at each wavelength (red and infrared) as compared with unsaturated blood, the amount of light absorbed at each wavelength by the blood in each pulse can be used to calculate oxygen saturation.
The light energy is beamed through a sample cell- a pulsating vascular bed, the patient's finger or toe for example. The remaining light energy not absorbed by the sample cell reaches a photodiode, on the of the sensor. The signal received by the photodiode is split into its red and infrared components, sampled, software filtered and displayed as a numerical value for oxygen saturation and as a waveform, the Plethysmogram.
Functional oxygen saturation is defined as: percentage saturation given by the oxyhaemoglobin concentration (cO2Hb) divided by the sum of the oxyhaemoglobin concentration and the deoxyhaemoglobin concentration (cHHb)
Fractional oxyhaemoglobin FO2Hb: oxyhaemoglobin concentration cO2Hb divided by the total
haemoglobin concentration, ctHb where
cO2Hb is the concentration of oxyhaemoglobin;
ctHB is the concentration of total haemoglobin.
This is sometimes reported as a percentage (multiplying the fraction by 100).
Finctional saturation represents the amount of oxyhemoglobin as a percentage of the hemoglobin that can be oxygenated. Dysfunctional hemoglobin (COHb and METHb) are not included in the measurement of functional saturation.
Image /page/3/Figure/11 description: This image shows a graph with two curves plotted on it. The x-axis ranges from 500 to 1,000, while the y-axis ranges from 10 to 20,000. There are two vertical dashed lines, one labeled "Red 660nm" and the other labeled "Infrared 940 nm."
Pulse Oximetry - Extinction Coefficients vs. wavelength (nm)
Pulse rate is calculated by measuring the time interval between the peaks of the infrared light waveform.
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Image /page/4/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo consists of a stylized eagle with three stripes forming its body and wings. The eagle is facing right. The text "DEPARTMENT OF HEALTH & HUMAN SERVICES • USA" is arranged in a circular fashion around the eagle.
Food and Drug Administration 10903 New Hampshire Avenue Document Control Room -WO66-G609 Silver Spring, MD 20993-0002
Mr. Robert H. Schiffman Quality Assurance Manager Dixtal Medical, Incorporated 101 North Plains Industrial Road Wallingford, Connecticut 06492
JUL 2 5 2011
Re: K103285
Trade/Device Name: Dixtal DX-4100 Series Pulse Oximeter Regulation Number: 21 CFR 870.2700 Regulation Name: Oximeter Regulatory Class: II Product Code: DQA Dated: July 20, 2011 Received: July 21, 2011
Dear Mr. Schiffman:
We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act) that do not require approval of a premarket approval application (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration. Please note: CDRH does not evaluate information related to contract liability warranties. We remind you, however, that device labeling must be truthful and not misleading.
If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.
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Page 2 - Mr. Schiffman
Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); medical device reporting (reporting of medical device-related adverse events) (21 CFR 803); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820); and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please go to http://www.fda.gov/AboutFDA/CentersOffic es/CDRH/CDRHOffice s/ucm115809.htm for the Center for Devices and Radiological Health's (CDRH's) Office of Compliance. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR Part 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to http://www.fda.gov/MedicalDevices/Safety/ReportaProblem/default.htm for the CDRH's Office of Surveillance and Biometrics/Division of Postmarket Surveillance.
You may obtain other general information on your responsibilities under the Act from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (301) 796-7100 or at its Internet address http://www.fda.gov/MedicalDevices/Resourcesfor You/Industry/default.htm.
Sincerely yours.
Anthony Dim-
Anthony D. Watson, B.S., M.S., M.B.A. Director Division of Anesthesiology, General Hospital, Infection Control and Dental Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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# Indications for Use
## 510(k) Number (if known)
## Device Name: Dixtal DX-4100 Series Pulse Oximeter
Indications for use: The Dixtal DX-4100 Series Pulse Oximeter monitors are intended to provide continuous, non-invasive monitoring of functional arterial oxygen saturation (SpO2) and pulse rate in neonatal, infant, pediatric and adult patients, in environments where pulse oximetry is indicated for use, when in the judgment of a licensed medical practitioner/physician pulse oximetry is required.
Prescription Use
AND/OR
Over-The-Counter Use _
(Part 21 CFR 801 Subpart D)
(21 CFR 801 Subpart C)
(Please do NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
L. Schulta
Division Sign-Off) Division of Anesthesiology, General Hospital Infection Control, Dental Devices
510(k) Number:
K.103285
Two short videos show you everything — or skip straight to the written tutorial if you'd rather read. You can reopen this any time from the Tutorial button in the top bar.
Part 1 — Search, results, and everyday workflows 16 min
Part 2 — Embeddings: the galaxy map 3 min
1. Search: exact and fuzzy
Type a phrase like "coronary artery calcification" into the search box. You get two kinds of results. Exact results match the literal phrase — prefix searches work ("coronary artery calcificati") but suffix searches do not. Fuzzy results match on the meaning and intent of your phrase rather than the exact words, and are sorted by relevance score. Hover over the Exact or Fuzzy badge on any row to see exactly why it matched.
Use the checkboxes above the results to narrow: SaMD keeps only software-only devices, AI / ML keeps only devices with AI.
Exact vs. fuzzy search: what's the difference?
Exact matches on the literal phrase (prefix search works, suffix does not). Fuzzy matches on the meaning and intent of the phrase rather than the exact words. Hover over the badge on any row to see why it matched.
You search "coronary artery calcification" and want only software devices with AI. What two filters do you apply?
Narrow by SaMD (software-only devices), then narrow by AI/ML (devices with AI).
2. The results table
Scroll right in the results table. The intended use is extracted for you — no need to open the PDF. The device story gives a high-level snapshot of what the device does and how it's used. The AI Performance sub-table shows each output name, acceptance criteria, observed values, and development/test dataset descriptions — the same format Innolitics uses for regulatory strategy outputs, and the fastest high-level fingerprint of an AI device. It is AI-generated but has been very reliable in practice.
Where do you find a device's intended use without opening the PDF?
Scroll right in the search results table. The intended use column is extracted for you; no need to dig into the 510(k) summary PDF.
What does the AI Performance sub-table show, and why is it useful?
Output name, acceptance criteria, observed values, development dataset description, and test dataset description. It's the same format we use for regulatory strategy output and Fast 510(k) input, and the fastest high-level fingerprint of an AI device. AI-generated but reliable in practice.
3. Judging fuzzy relevance
Fuzzy results trail off in relevance as you scroll. Use three signals to decide how far down to go: the fuzzy badge explanations, the intended use column, and whether your target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, you're past the relevant zone. A top hit with a low score (~0.4) and a stretched explanation is a hint the closest predicates are far away — the project may be headed for De Novo. Note the fuzzy search is a pattern match: it doesn't handle negation ("not") well, and hardware devices can appear — filter by SaMD/AI ML to cut them.
How do you judge how far down fuzzy search results to go?
Use the relevancy signals: the fuzzy badge explanations, the intended use column, and whether the target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, results are trailing off in relevancy.
4. Device detail page: chat and citations
Click a device name to open its detail page: device facts on the left, a chat window on the right. Ask something like "Describe the training data". The answer carries little citation bubbles — click one to jump to the highlighted passage in the source PDF, so you can verify every AI answer against the document. There's also a Download PDF button for sharing.
How do you verify an AI chat answer on the device detail page?
Click the citation bubbles to jump to the relevant highlight in the source document.
Reading rule for every project: how many summaries do you read in full?
At least the three most relevant 510(k) or De Novo summaries, in full. After that, use targeted chat questions to confirm your memory quickly. The tool supports this professional habit — it doesn't replace it.
5. Side-by-side comparison
Select multiple rows in the results table (aim for under ~10), then open the PDF Viewer tab. Ask one question — it goes to all selected devices in parallel, each with citations. This is the fastest way to compare and contrast devices: training data, PCCP scope, how they handled adding new scanners, and so on.
What does the side-by-side PDF viewer mode do?
Select multiple devices, open the PDF viewer tab, and ask one question (e.g., "Describe the training data"). It queries all selected devices simultaneously with citations, so you can compare and contrast quickly.
6. Collections
With rows selected, go to the Collections tab and create a labeled collection (e.g., "Cobb Angle Project"). Reload that selection any time — before a client call, pull up the collection and ask questions across all of its devices at once.
How do you save a set of selected devices for later use?
Select the rows, go to the Collections tab, and create a labeled collection (e.g., "Cobb Angle Project"). You can reload the selection anytime and carry it into the PDF viewer and other tabs that support selections.
7. Product codes and the regulations tree
Click a product code in the results to jump to it in the regulations tree — identification text, sibling product codes, and devices you can open in a PDF viewer on the right. Click a regulation number to see its identification, special controls, and related product codes. You can also search by product code or regulation number at the top of the tree. Always read the special controls if any exist for your device — it broadens your search and sharpens pre-kickoff research.
What can you do from the regulations tree view?
Browse product codes and regulation numbers, read the identification text and special controls, browse sibling product codes, open device PDFs on the right, and search by product code or regulation number at the top of the tree.
8. Chart view
Click Show Chart and segment by regulation number (or product code) to see which regulations dominate your result set. Clicking a regulation takes you into the regulations tree. Great for spotting that most matches are, say, hardware laparoscopic devices — a cue to go back and filter.
How do you see which regulations dominate a search result set?
Click "Show Chart" and segment by Regulation Number. Clicking a regulation takes you to the regulations tree.
9. The predicate graph
Open the Predicates tab for a family-tree view of predicate relationships. Click a node to trace its parents and children; selections from search carry over pre-selected. Commonly predicated devices are worth reading — a lot of people predicated them for a reason. The visual lineage is also handy on client calls, e.g. to show how a predicate family evolved and justify why your predicate still holds.
In the predicate graph, why are commonly predicated devices worth reading?
A lot of people predicated them for a reason. Clicking a node traces parents and children, and selections from search carry over pre-selected.
10. Embeddings: the galaxy map
The Embeddings tab plots every matching document in a 2-D "galaxy map" where semantically similar devices cluster together. Hover or click clusters to explore, and let AI label the clusters for you. Embeddings beat product codes for grouping: two devices can carry different product codes (LLZ vs. QIH) yet do the same thing — the embedding captures the meaning of the intended use and device story. This is also exactly how retrieval-augmented generation (RAG) works under the hood, and it makes a great visual on client calls.
Try it yourself
Head to the search page and work through a few of these AI/ML fuzzy searches to build intuition: perivascular fat on CT · aortic valve calcification opportunistic screening on noncontrast CT · breast cancer prediction on digital pathology slides · autism detection · gestational age prediction · a hearing aid that can also detect a pulse · foundation model based analysis of ECG · large language models · penetration test. Watch how the relevance scores, intended use, and AI Performance tables tell you when results stop being meaningful.